How do you start a centrifugal chiller?

• A. Start the chilled water pump, start condenser water pump, check oil, start cooling tower, start compressor
• B. Start compressor, Start chilled water pump, Start condenser water pump, Check oil, Start cooling tower
• C. Check oil, Start chilled water pump, Start condenser water pump, Start cooling tower, Start compressor
• D. Start chilled water pump, Start cooling tower, Start condenser water pump, Check oil, Start compressor

Answer: (A)

Starting a centrifugal chiller safely hinges on establishing the water circuits and lubrication before the compressor ever runs. Begin by starting the chilled water pump so the evaporator has water flow to carry away heat. Then start the condenser water pump to ensure the condenser has circulating water to reject heat. After the water systems are moving, check the oil level or oil pressure to confirm the compressor is properly lubricated before operation. Once lubrication is verified, start the cooling tower so the condenser can be cooled effectively when the compressor begins running. Finally, start the compressor, now that water flow is established and lubrication is confirmed, providing a controlled and protected startup with proper heat rejection.